An electric heater has a rating of 2 kW, 220 V. The cost of running the heater for 10 hours at the rate of Rs 350 per unit is Rs ____

216

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165

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209

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105

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Solution

The correct option is D 105
Power is energy consumed per unit time.

Here, energy consumed $= P = 2 k W = 2000 W$ and time $= t = 10 h r = 36000 s$

$P = \frac{E}{t}$

$⟹ E = P t = 2 k W \times 10 h = 20 k W h = 20 u n i t s$

Since $1 u n i t = 1 k W h$

Cost $= 20 \times 350 = R s 7000$

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An electric heater has a rating of 2 kW, 220 V. The cost of running the heater for 10 hours at the rate of Rs 350 per unit is Rs ____

The correct option is D 105Power is energy consumed per unit time.Here, energy consumed=P=2kW=2000W and time=t=10hr=36000sP=Et⟹E=Pt=2kW×10h=20kWh=20unitsSince 1unit=1kWhCost=20×350=Rs7000

The correct option is D 105
Power is energy consumed per unit time.

Here, energy consumed $= P = 2 k W = 2000 W$ and time $= t = 10 h r = 36000 s$

$P = \frac{E}{t}$

$⟹ E = P t = 2 k W \times 10 h = 20 k W h = 20 u n i t s$

Since $1 u n i t = 1 k W h$

Cost $= 20 \times 350 = R s 7000$